Abstract
Dandy–Walker malformation (DWM) and Cerebellar vermis hypoplasia (CVH) are commonly recognized human cerebellar malformations diagnosed following ultrasound and antenatal or postnatal MRI. Specific radiological criteria are used to distinguish them, yet little is known about their differential developmental disease mechanisms. We acquired prenatal cases diagnosed as DWM and CVH and studied cerebellar morphobiometry followed by histological and immunohistochemical analyses. This was supplemented by laser capture microdissection and RNA-sequencing of the cerebellar rhombic lip, a transient progenitor zone, to assess the altered transcriptome of DWM vs control samples. Our radiological findings confirm that the cases studied fall within the accepted biometric range of DWM. Our histopathological analysis points to reduced foliation and inferior vermian hypoplasia as common features in all examined DWM cases. We also find that the rhombic lip, a dorsal stem cell zone that drives the growth and maintenance of the posterior vermis is specifically disrupted in DWM, with reduced proliferation and self-renewal of the progenitor pool, and altered vasculature, all confirmed by transcriptomics analysis. We propose a unified model for the developmental pathogenesis of DWM. We hypothesize that rhombic lip development is disrupted through either aberrant vascularization and/or direct insult which causes reduced proliferation and failed expansion of the rhombic lip progenitor pool leading to disproportionate hypoplasia and dysplasia of the inferior vermis. Timing of insult to the developing rhombic lip (before or after 14 PCW) dictates the extent of hypoplasia and distinguishes DWM from CVH.
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Data availability and materials
Normal human material was provided by the Joint Medical Research Council/Wellcome (MR/R006237/1) HDBR (www.hdbr.org), and the BDRL, University of Washington (NIH R24 HD000836 awarded to IAG). Human tissue used in this study was covered by a material transfer agreement between SCRI and HDBR/BDRL. Sequence data will be available upon request.
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Acknowledgements
We thank the staff at Human Developmental Biology Resource and Birth Defects Research Laboratory; Xuemei Deng, Conrad Winter, Jennifer Forrer (Seattle Children’s Hospital) and Armelle De Mauduit (APHP) for their technical help and support.
Funding
National Institutes of Health R01 NS080390 and R01 NS095733 (KJM). National Ataxia Foundation Young Investigator Research Grant, Brain and Behavior Research Foundation Young Investigator Award #28956, and Franklin Research Award by the American Philosophical Society (PH).
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PH and KJM conceived, designed, and oversaw the execution of the study. Data collection and analysis was performed by PH, TS, SB, DD, AHS, JM, DD, MD, AET, BDD, and JTP. Samples and radiological data were provided by SB, LM, KM, OO, FG, IAG, HAB, RR, JRS, DK, FR, GP, NR, CDG, and ES. KAA designed and oversaw LCM and RNA-seq data collection and analysis. PH and KJM wrote the first draft. All authors reviewed and critiqued the manuscript.
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401_2021_2355_MOESM1_ESM.pdf
Supplementary file1 (PDF 1241 KB) Suppl. Fig. S1: List of DWM and CVH cases used in the study (H&E). H&E stained midsagittal sections of the DWM cerebella included in the study. A subset of cases has been described previously [13, 18, 20]. Suppl. Fig. 2: Autopsy images of cases used in the study. Suppl. Table S1: List of normal, DWM and CVH cases used in the study. Suppl. Table S2: Specimen and sample characteristics for LCM RNA-seq. Suppl. Table S3: Rhombic lip LCM RNA-seq differential expression analysis and gene expression.
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Haldipur, P., Bernardo, S., Aldinger, K.A. et al. Evidence of disrupted rhombic lip development in the pathogenesis of Dandy–Walker malformation. Acta Neuropathol 142, 761–776 (2021). https://doi.org/10.1007/s00401-021-02355-7
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DOI: https://doi.org/10.1007/s00401-021-02355-7